Single-Phase Split-Inductor Differential Boost Inverters

Khan, Ashraf Ali; Lu, Yun; Eberle, Wilson; Wang, Liwei; Khan, Usman Ali; Cha, Honnyong

doi:10.1109/tpel.2019.2913750

Cited by 25 publications

(17 citation statements)

References 30 publications

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“…In all three cases, only four active switches are used to realize the basic inverter circuit and reduce the leakage current until practically eliminate it. The reduction in common-mode frequency has also been achieved using transformerless topologies with multilevel neutral point clamp [68] or its variant, using split inductors [69].…”

Section: Common-grounded Invertermentioning

confidence: 99%

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

et al. 2020

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The rise in renewable energy has increased the use of DC/AC converters, which transform the direct current to alternating current. These devices, generally called inverters, are mainly used as an interface between clean energy and the grid. It is estimated that 21% of the global electricity generation capacity from renewable sources is supplied by photovoltaic systems. In these systems, a transformer to ensure grid isolation is used. Nevertheless, the transformer makes the system expensive, heavy, bulky and reduces its efficiency. Therefore, transformerless schemes are used to eliminate the mentioned disadvantages. One of the main drawbacks of transformerless topologies is the presence of a leakage current between the physical earth of the grid and the parasitic capacitances of the photovoltaic module terminals. The leakage current depends on the value of the parasitic capacitances of the panel and the common-mode voltage. At the same time, the common-mode voltage depends on the modulation strategy used. Therefore, by the manipulation of the modulation technique, is accomplished a decrease in the leakage current. However, the connection standards for photovoltaic inverters establish a maximum total harmonic distortion of 5%. In this paper an analysis of the common-mode voltage and its influence on the value of the leakage current is described. The main topologies and strategies used to reduce the leakage current in transformerless schemes are summarized, highlighting advantages and disadvantages and establishing points of comparison with similar topologies. A comparative table with the most important aspects of each converter is shown based on number of components, modes of operation, type of modulation strategy used, and the leakage current value obtained. It is important to mention that analyzed topologies present a variation of the leakage current between 0 to 180 mA. Finally, the trends, problems, and researches on transformerless grid-connected PV systems are discussed.

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Section: Common-grounded Invertermentioning

confidence: 99%

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

et al. 2020

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“…On the other hand, for control performance [35][36][37][38][39][40][41][42], differential inverters incorporate a low number of switches (only six switches for buck-boost DC-DC converters), resulting in uncomplicated gate-driver circuits and simple PWM strategies. The similarity between differential inverters and the traditional VSI inverter expedite the control function, where VSI control was well-known and studied extensively for a long time [42,53].…”

Section: Introductionmentioning

confidence: 99%

Single-Stage Three-Phase Grid-Tied Isolated SEPIC-Based Differential Inverter With Improved Control and Selective Harmonic Compensation

2020

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The simple circuit based on DC-DC converters is the main attractive feature of the differential inverter topologies. It has a single-stage and provides modularity and scalability. However, the Negative Sequence Harmonic Component (NSHC) generated at the output terminal may hinder its practical applications. This paper presents a single-stage three-phase isolated differential inverter based on three High-Frequency Link (HFL) transformer-based DC-DC SEPIC converters. The utilized SEPIC converters perform voltage step-up/ down capability with galvanic isolation, which is essential for Renewable Energy Sources (RES). It mitigates the Common-Mode Voltage (CMV) and ElectroMagnetic Interference (EMI). Moreover, this paper proposes a two-loop based d-q synchronous frame grid-current control to mitigate its NSHC. A Type-II compensator and simple NSHC detection circuit are proposed to enhance the inverter's stability and compensate phase-delay of the utilized SEPIC converters. NSHC detection is developed using three cascaded Low Path Filters (LPFs). A 1.6kW inverter prototype was set to validate the performance of the proposed inverter and its control. The control is implemented by the MWPE3 C6713A Expert III DSP board. The proposed topology has a maximum efficiency of 89.744 at 700W output power and 86.4% at full power. The proposed control decreases the NSHC from 40.6 % to 1.614%, which shows its accuracy and precision. Furthermore, THD is reduced from 35.61% to 4.087% and satisfy the recent grid codes (<5%). The simulation results using PSIM software, power loss distribution, and a comparison study of the proposed inverter with similar topologies are also presented.

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“…The boost inverter is modulated to generate pure AC output voltages with phase shift of 120° with no need for output filter 24,25 . Boost inverter can be employed efficiently for various renewable energy source grid‐tied applications 26,27 . The main drawback of boost inverter is that it provides operation with boosting capability only.…”

Section: Introductionmentioning

confidence: 99%

“…24,25 Boost inverter can be employed efficiently for various renewable energy source grid-tied applications. 26,27 The main drawback of boost inverter is that it provides operation with boosting capability only. To have both boosting and bucking capabilities, three-phase three-legs buck-boost inverter was previously presented, based on bidirectional DC/DC buck-boost converters.…”

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confidence: 99%

Three‐phase two‐leg buck‐boost DC‐AC inverter with differential power processor unit

Hossam-Eldin

Elserougi

Abdelsalam

et al. 2020

Circuit Theory & Apps

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Renewable energy sources (RESs) need power-electronics-based converters to deliver the acquired power to the grid. Those converters should provide voltage-bucking/boosting capabilities to accommodate various grid modes specially for three-phase distorted commonly unbalanced distribution utility networks. Several power electronic-based converters have been elaborated to fulfill this high-demand market. Single-stage converters are the most dominant in the market where the current source inverters (CSIs), impedance source inverters (ZSIs), and boost inverters are the high-end candidates. The aspects of cost, footprint, and minimal numbers of active switches, in addition to simplified controllability, build the main challenges that face the evolution of robust renewable energy-associated grid-tied converters. This paper presents a novel three-phase differential-mode buck-boost inverter based on two bidirectional buck-boost DC/DC converters and one differential power processor (DPP) unit. The proposed topology is a single-stage DC/AC converter offering bucking/boosting capability, with reduced hardware requirements. The proposed topology features a simplified control methodology in addition to reduced size and cost of the hardware setup which makes it more suitable for grid-tied renewable energy applications. The operation principles, small-signal model, and control strategy of the proposed topology are also illustrated. Simulation and experimental results are presented in details to verify the topologyenhanced performance under various operating conditions. The deducted results elucidate the viability of the proposed configuration alongside with the claimed merits. K E Y W O R D S DC/AC buck-boost inverter, DC/DC buck-boost converter, three-phase DC/AC inverter, threephase two-leg inverter 1 | INTRODUCTION Various renewable energy sources require the utilization of power electronics-based converter for maximum power tracking and grid integration purposes. The conventional two-level voltage source inverter (VSI) has been the most common grid-tied converter topology for DC/AC conversion applications. Due to the voltage buck nature of VSI, the

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Single-Phase Split-Inductor Differential Boost Inverters

Cited by 25 publications

References 30 publications

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

Single-Stage Three-Phase Grid-Tied Isolated SEPIC-Based Differential Inverter With Improved Control and Selective Harmonic Compensation

Three‐phase two‐leg buck‐boost DC‐AC inverter with differential power processor unit

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